WELL SCREEN FOR THE TECHNOLOGY OF WATER- CUT OIL DOWNHOLE SEPARATION

Abstract

Background According to a number of studies, the efficiency of the preliminary water discharge units in terms of the quality of the discharged water and the amount of residual water in oil depends on the degree of destruction. With an increase in the latter, the efficiency of the pre-dumping installations increases significantly. In oil-gathering reservoirs, due to the relatively low flow rates, emulsification of liquids practically does not occur and, moreover, conditions are created for the deposition of large water droplets along the cross-section of the pipeline and the formation of a continuous underlying layer of water, which can be captured by ground filters. The most intensive emulsification of formation fluids occurs in the working bodies of electric centrifugal pumps in production wells. The emulsions formed in these pumps have the greatest stability and interface. Aims and Objectives To prepare liquids for stratification in pre-discharge units, it is most expedient to install filters in separator wells before electric centrifugal pumps. The authors consider that the disadvantage of these installations is the insufficient quality of water treatment, since water is not filtered from solid suspended particles and oil globules. To solve this problem, it is proposed to install a volumetric filtration filter made from a package of brush disks and located on a tubing string in a downhole water discharge unit. Results The results of bench tests of the structure of the downhole volumetric filtration filter for the downhole separation technology are presented, the layouts of the main submersible equipment are shown. It has been substantiated that the use of this filter will allow: o to increase the productivity of wells due to the efficiency of gravitational stratification of water-oil liquid on the developed surface of the filter brush discs; o reduce the cost of the filter cleaning operation in comparison with known filters; o to increase the degree of purification of the product (water) from impurities; o prevent erosional destruction of the inner surface of the tubing string.